Axisymmetric magnetic pumping for Tokamak heating

Koechlin, F.; Samain, A.

doi:10.1088/0032-1028/14/3/010

Cited by 6 publications

(9 citation statements)

References 5 publications

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“…[192], calls for much less r. f. power to achieve the same heating, but has the potential disadvantage of spoiling the tokamak axisymmetry. An axisymmetric variant of the scheme of [192] is suggested in [193]: an elliptical (m = 2, n = 0) perturbation produces torsionaltype pumping in the outer regions of the tokamak plasma. These elegant new ideas have not as yet been implemented in practice; to combine them with tangential neutral-beam injection might be of considerable experimental interest.…”

Section: Magnetic Pumping and Compressionmentioning

confidence: 99%

Tokamak research

Furth

1975

Nucl. Fusion

178

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Progress in tokamak research is reviewed for the period 1971–74. The theories of MHD-stability, classical transport and anomalous transport have been refined. The tokamak device population has increased by about an order of magnitude. Non-Ohmic heating methods have been developed successfully. The severity of the problem of plasma impurity has been recognized, and technological countermeasures are being developed. The experimental results on energy confinement are not yet well understood theoretically and cannot be fitted by any simple empirical transport coefficient; the general empirical trend, however, is favourable to the achievement of reactor plasma conditions in large future tokamak devices.

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Section: Magnetic Pumping and Compressionmentioning

confidence: 99%

Tokamak research

Furth

1975

Nucl. Fusion

178

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“…(2.7). Other proposed clamping methods include oscillation of the plasma column at the transit frequency of hot ions around the torus ('wobble clamping') [34], and the application of resonant electromagnetic waves [35].…”

Section: Energy Clampingmentioning

confidence: 99%

Neutral-beam-driven tokamak fusion reactors

Jassby

1977

Nucl. Fusion

120

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The ion velocity distributions of tokamak plasmas sustained by injected fast atomic beams fall into three categories, according to the partial pressure of the energetic-ion population, which in turn is determined by the plasma nτE, the injection energy, and the fraction of plasma fuelling performed by the beams. There are correspondingly three regimes of beam-driven reactor operation in D-T or D-D: thermonuclear; beam-target or TCT; and plasmas with ion pressure/electron pressure ≫ 1. This review treats the physical basis and plasma engineering parameters of beam-driven tokamak reactors. The theories of energetic-ion velocity distributions, stability, injection, and orbits are summarized. The many-faceted role of the energetic ions in plasma heating, fuelling, and current maintenance, as well as in the direct enhancement of fusion power multiplication and power density, is discussed in detail for the three reactor types. The relevant implications of recent experimental results from several beam-injected tokamaks are examined. The behaviour of energetic ions is found to be in accordance with classical theory, large total ion energy densities are readily achieved, and plasma equilibrium and gross stability are preserved. The status of neutral-beam injectors and of conceptual design studies of beam-driven reactors is reviewed briefly. The principal plasma-engineering problems are those associated directly with achieving quasi-stationary operation, particularly the problem of high-throughput particle exhaust. An especially attractive feature of beam-driven tokamak plasmas is their capability for useful application in devices of relatively small size.

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“…(2.7). Other proposed clamping methods include a rigid displacement of the plasma column at the transit frequency of hot icns around the torus ("wobble clamping") [29], and the application of resonant electromaqnetic waves [30].…”

Section: Energy Clampingmentioning

confidence: 99%

“…The additional heat source available to cold electrons reduces the tendency ot the d1scharge region"to shrink during gas'puffing. The proposed "wobble" technique, in which energy is introduced into the hot ions by oscillation of the vertical field at the ion transit frequency around the torus [29], seems more suitable for quasi-stationary heating. ,.. Again, the equilibrium-field circuit provides the additional energy.…”

Section: E Ity Vb May Be Comparable With V 1 Ementioning

confidence: 99%

“…Clamping by the toroidal electric field [27] appears a~so to be effective, but substantial enhancement of Q seems unattainable by this method because of the accompanying large ohmic dissipation [117]. An attractive technique is a rigid displacement of the• plasma column at the transit frequency around the• torus of phase-bunched fast ions [29], but this method has been scarcel:r investigated. Another proposed method is the application of harmonic ion--cyclotron resonant heatin9; the production of f.;l~t;-ion tails by this means has been demonstrated on several devices [118], but the method seems likely to be useful only for systems of very low r.…”

Section: -3 Reaches 5 111hen N T -3><10mentioning

confidence: 99%

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Neutral-beam-injected tokamak fusion reactors: a review

Jassby¹

1976

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The ion velocity distributions of tokamak plasmas sustained by injected neutral-atom beams fall into three categories, according to the partial pressure of the energetic-ion population, which in turn is determined by the plasma nTE' the injection energy, and the fraction of plasma fueling performed by the beams.There are correspondingly three regimes of beam-driven reactor operation in D-T or D-D: thermonuclear; beamtarget or TCT; ion pressure/electron pressure>> 1.This review treats the physical basis and plasma engineering parameters of beam-driven tokamak reactors.The theories of energetic-ion velocity distributions, stability, injection, and orbits are summarized.The many-faceted role of the energetic ions in plasma heating, fueling, and current maintenance, as well as in the direct enhancement of fusion power multiplication and power density, is discussed in detail for the three reactor types. The relevant implications of recent experimental results on several beam-injected tokamaks are examined. The behavior of energetic ions is found to be in accordance with classical theory,-iilarge total ion energy densities are readily achieved, and plasma equilibrium and stability are maintained.The status of neutral-beam injectors and of conceptual :design studies of beam-driven reactors are briefly'reviewed. The principal plasma-engineering problems are those associateci directly with achieving quasi-stationary operation. An especially attractive feature of beam-driven tokama~ plasmas is their capability 'for useful applicat~~P in devices of relatively sma l.l size.

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Axisymmetric magnetic pumping for Tokamak heating

Cited by 6 publications

References 5 publications

Tokamak research

Tokamak research

Neutral-beam-driven tokamak fusion reactors

Neutral-beam-injected tokamak fusion reactors: a review

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